Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70a907720c03dea…

MALICIOUS

PDF

66.6 KB Created: 2021-03-15 19:59:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5939397fd8353b9bdddffebd5e30b70 SHA-1: ac8fef3140c6cccb7726862714218fa796a4cbf5 SHA-256: b70a907720c03dea2edcfea6c757c16c8172e9e49584d3abd90d6dd13b782b95
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with a primary focus on a link to 'mezovuduw.ru', which is flagged as a link farm on disposable hosting. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to educational exercises, suggesting a social engineering tactic to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8526

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/aws?utm_term=participle+and+participial+phrase+exercises+with+answers+pdf
    • https://tidekomix.weebly.com/uploads/1/3/4/4/134441433/5842889.pdf
    • http://smm-target.ru/68657369676enpdw.pdf
    • https://fixefukazadutux.weebly.com/uploads/1/3/1/6/131607703/7622861.pdf
    • https://cdn-cms.f-static.net/uploads/4416675/normal_6026a58610c73.pdf
    • http://borejukeluteva.mygamesonline.org/all_blues_chords.pdf
    • http://gazozasi.scienceontheweb.net/sketchup_make_2015_free_license.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/lawilotikepigox.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/xutisalubakutaxijune.pdf
    • http://nosixavol.sportsontheweb.net/acca_f2_revision_kit_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4408853/normal_6015e0d7e3016.pdf
    • https://cdn-cms.f-static.net/uploads/4477167/normal_600c3be4881b8.pdf
    • http://kojurebajalafaw.22web.org/bepoxebolimabani.pdf
    • http://passive-income.ru/kick_the_buddy_forever_hack_mod_apksz3gf.pdf
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/602171.pdf
    • https://cdn-cms.f-static.net/uploads/4463559/normal_60214dba288ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fowikorejodi/riwimoxaz.pdf
    • https://s3.amazonaws.com/jinotugiwomo/pensar_rapido_pensar_lento_resumen.pdf
    • http://femudabobizad.rf.gd/24572914520.pdf
    • https://s3.amazonaws.com/sazariwapa/ridgeway_grandfather_clock_winding_key.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e002.bin
8d53843d3589a3eef8a6dec149148f2a131150c6f941f3a8845c6c8f320d1d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 5404 bytes

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